Re: [jgroups-dev] org.jgroups.protocols.UDP - failed sending message to null

Let's start from scratch: what exactly is the error ? The code in 
Discovery.start() which calls sendGetMembersRequest() catches the 
InterruptedIOException, therefore you shouldn't even see this.

The InvalidArgument IOException is new, how do you arrive at this ? How 
do you reproduce it ?

[1] https://issues.jboss.org/browse/JGRP-1161


On 12/16/10 8:37 PM, Adrian Tarau wrote:
> It's in the ticket, 2.10. I see thread interruption handling so it's not
> that causing the exception, it's an IOException and it happens on the
> multicast receiver & timer thread.
>
> The error message "Invalid argument" reminds me of failures when I did
> some experiments with MulticastSocket. After several attempts to track
> where the exception is thrown it is actually the MulticastSocket, it
> fails in UDP:
>
> /private void _send(InetAddress dest, int port, boolean mcast, byte[]
> data, int offset, int length) throws Exception {
> DatagramPacket packet=new DatagramPacket(data, offset, length, dest, port);
> try {
> if(mcast) {
> if(mcast_sock != null && !mcast_sock.isClosed())
> * mcast_sock.send(packet);*
> }
> else {
> if(sock != null && !sock.isClosed())
> sock.send(packet);
> }
> }
> catch(Exception ex) {
> throw new Exception("dest=" + dest + ":" + port + " (" + length + "
> bytes)", ex);
> }
> }
> /
> The DatagramPacket buffer has 103 bytes and it tries to send to
> 228.110.10.10:46553(tried different addresses but it still fails).

-- 
Bela Ban
Lead JGroups / Clustering Team
JBoss

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